Overlapped composite component and method for manufacturing overlapped composite component

A method for manufacturing a layered composite component, wherein the layered composite component includes a plate-shaped base member formed from a plastic material, a cover member layered with the base member, and a stitching, the cover member includes a plate-shaped main body and projections, the main body extends along the base member such that the main body is spaced apart by a gap from the base member, the projections project from an opposing surface of the main body opposed to the base member, and the cover member is formed from a plastic material and is elastically deformable, the stitching is formed by a sewing thread on the main body, the cover member includes a stitched portion linearly extending and including a portion of the opposing surface on which the stitching is formed, the projections are not formed on the stitched portion, and the stitched portion includes a ridge extending along the stitching, the method comprising:

• as a sewing apparatus configured to form the stitching, using a sewing apparatus including two rising plates extending from an edge of a thread plate defining a thread hole so that the two rising plates extend parallel in a direction in which a sewing subject is fed;
• and
• when the ridge is fitted to a gap between distal ends of the two rising plates, forming the stitching with the sewing apparatus sewing the stitched portion while feeding the cover member in one direction, wherein
• the ridge projects toward the base member,
• the ridge is configured to come directly into contact with the base member as a gap between the base member and the main body is reduced, and
• the ridge is one of two ridges and the two ridges are arranged one on each side of the stitching.